What is the use of virtual, sealed, override, and abstract?

 Posted by Tripati_tutu on 12/22/2010 | Category: C# Interview questions | Views: 6533 | Points: 40

• The use of virtual keyword is to enable or to allow a class to be overridden in the derived class.
• The use of sealed keyword is to prevent the class from overridden i.e. you can’t inherit sealed classes.
• The use of override keyword is to override the virtual method in the derived class.
• The use of abstract keyword is to modify the class, method, and property declaration. You cannot directly make calls to an abstract method and you cannot instantiate an abstract class.

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